Control mechanism for electric motors.



1. BUCKLEYQ CONTROL MECHANISM FOR ELECTRIC MOTORS.

APPLICATION FILED MAY 28. m3 1,136,405, Patented Apr. 20, 1915.

3 SHEETS-SHEET 1.

I I. BUCKLEY.

CONTROL MECHANISM ron ELECTRIC MOTORS. APPLICATION FILED MAY 23, 1913.

'1 ,136,405. I Patented Apr. 20, 1915.

3 SHEETS-SHEET 2.-

wm I 7 1; BUCKLEY. I CONTROL MECHANISM FOR ELECTRIC MOTORS. APPLICATION FILED MAY 28, l9l3- 1 136 405 A Patented Apr. 20, 1915.

. 3 SHEETS-SHEET 3.

I i I.

| I I I I UNITED s'rA'rEs rATEN'r OFICE.

JOHN BUCKLEY OF BOSTON, MASSACHUSETTS, ASSIGNOR T ADOLPH SOMMER, 015' BOSTON, MASSACHUSETTS.

CONTROL MECHANISM FORELECTRIC MOTORS.

Specification of Letters Patent.

Patented Apr. 210, 1915.

To all whom 'it may concern:

Be it known that I, JOHN BUGKLEY, a

citizen of the United States, residing at Boston, in the county of Sufiolk and State of Massachusetts, have invented certain new and useful Improvements in Control Mechanism for Electric Motors; and I do hereby declare the following to be a full, clear, and exact description of the same, reference ,being had to the accompanying drawings,

forming part of this specflication, and to the figures and letters of reference marked thereon.

The apparatus of the present invention is designed more especially for controlling small electric motors designed to run'advertisingdevices, the object of the invention being to provide a controllingmechanism which may be manually set to establish the motor circuit and automatically operated by the motoritself to break the circuit and arrest the movement. of the motor after a predetermined time, the parts being left in such position that they may be again manually set for establishing the circuit by the part. Y The invention consists prlmarily 1n a motor controlled mechanism having a fixed and simple manipulation of a hand operated a movable contact through which the motor 3 clrcult 1s estabhshed, a driving connection.

from the motor for the movable contact and a manually'controlled operating connection motor controlled driving connection being adapted'toadvance the movable contact for 40breaking or disrupting the circuit.

The invention further consists in' certain novel details of construction and combinations and arrangements of parts, all as will be hereinafter, described and pointed out particularly in the appended claims.

Referring to the accompanying drawings,Figure 1 is a top plan view of a motor and its control mechanism embodying the present improvements, certain parts of the driving connections for the advertising mechanism being shown. Fig. 2 is an elevation looking at the field magnet side. of the motor. Fig. 3 is an elevation froni a point of view at right angles to Fig. 2,1w1th parta:

broken away to show, parts whichlwould otherwise beconcealed from View. Fig. 4 is 2, the pole pieces of which are preferably arranged at the ends or top and bottom of an armature 3. The armature 3 usually embodies three separate coils or windings, the

cores of which terminate in segmental top .an dbottom pole pieces 4, and it is mounted on a vertical axis with bearings 5 at top and bottom. 'The commutator and brushes are preferably arranged at the upper end of the armature'as shown at 6, and the lower end of the armature shaft is in the form of a driving screw or worm 6 whereby with a comparatively. light torque a considerable power may be developed for driving the main shaft 7 through a worm wheel 7 in mesh with the wor The shaft 7 is journaled in the frame 8,

- which latter also carries the motor, and is provided at opposite ends with pinions 9 with which gear wheels 10 and 11 mesh, said gear wheels constituting the drivers for the display and advertising devices not shown herein. The gear wheel 11 is carried by a shaft journaled in the frame and. at the end opposite said gear wheel provided with a short crank or eccentric 12 which constitutes the primary driving connection for the switch mechanism to be hereinafter described. 1

While the controlling or switch mechanism may be mounted in any desired position with relation to the motor it is preferably mounted on the upper pole pieces of the field magnets, its direct support being formed by a piece of fiber or insulating material 13 rigidly secured upon the said pole pieces and adapted to suport a frame or casting 14 having bearings in which is mounted a worm shaft 15'and a vertically extending stud or post 16 rigid with the frame 14. The worm 15 mesheswith a worm wheel 17 journaled cn'the post 16, whereby, upon the rotation of the worm, the wheel 17 will be rotated with considerable power, but at 'a the arm 20 is also preferably elongated the path of movement of the movable con tact 18 and'its forward end 22' is bent down:

wardly to cooperate with the notch .19 and thereby maintain the parts in engagement until they are separated by a positive driving movement or pressure applied tothe movable contact. This driving movement is imparted to the movable contact by a pinv 23 mounted onthe worm wheel 17 and it is adapted to advance the movable contact out of engagement with thefixed contact and to leave it in such position that it may be still farther advanced manually througha suflicient arc of the circle to. again come into effective contact engagement with the member 20. For elfectuating thismanual movement, the post 16 is adapted for the reception of a key 24 within the cavity of which there is a spring 25 for normally, holding the key in its elevated position, where it is out of engagement with any of the switch members. The lower end of the key is however provided with a finger 26, which when the key is depressed, lies in the path of movement of a pin 27 on the movablecontact 1 8 and consequently by depressing the key and imparting a rotary movement thereto, the movable contact will be swung around-into contacting position to reestablish the circuit after the same has been broken by the opera tion of the motor. v

Theuaction of the fixed contact on the movable contact at the instant when the lat- I ter has been advanced to a point where the parts are about to separate is to project the movable contact forwardly to thereby dis 'rupt the circuit with a snap action so as to avoid injurious'arcing or sparking such as might occur with a slow separating movement of the parts.

The circuit wires may be attached to binding posts 28 and 29, both mounted on the frame 14, with suitable insulating material for preventing short circuiting in the well understood manner, and in the preferred construction the binding post 28 isconnected i directly'with or forms the anchorage. for the fixed resilient contact20, audit will be understood. that the binding post 28, fixed contact 20, movable contact 18 and frame 14, on which the movable contact is mounted are included in the circuit which supplies current to the motor.

For-"operating the worm shaft 15 such movement. The

" rotation of the wheel 17 and r tically any desired interval o from the" crank 12,"theworm' shaft is. preferably provided' from'its endfwith a disk or, wheel 30' and arr-oscillatory operating arm 31 having a spring ress'ed friction paw1j32 thereon for cooperation withthe d1sk'30. It is connected by anadjustable link 33 with the outer end of a lever 34 journaled on the frame bya slotconnection 35 and having a bearingfor the crank 12-before referredto;

the parts, itbeing thus possible to give theoperating arm-31 a throw; which is equal-to that of the outer end of the lever 34, or a throw which-is only fractional part or interponent illus trated is in theform of a 'quadrant'37 having a cam "shaped periphery andadapted to be heldin adjusted position by a screw 38. The quadrant may-be graduated to'facili tat'e its adjustment for operatingthe switch member in any desired predetermined time, which time may be empirically determined after the speed of'the motor is established by the 7 current supplied to the same.

The main frame of the apparatus is shown a as mounted on one end" of a tank 40, which thus constitutes a part of the support, the apparatus'being specifically designed for ad- "ertisin g" the water proof qualities of leather or footwear which will berepeatedly mersed in the water in the tankland withdrawn by the operation of the motor in connection with a display of suitable signs, all of which," however, forms no .part of the present-invention.

.In operation the motor is started by Inanipulating the key 2 4 so as to'bring the rhovable contact 18 into'engagement with the re- I silient" fixed contact 20. The motor through the connections" described reciprocate's the operating. arm 31 to thereby intermittently advance thGcVOIIIl shaft 15, reverse movement being prevented by the check pawl 39 The worm shaft 15 in turn operates the worm wheel 17 and advances the pin 23 untiL 1-15" it finally engages and moves contact 18 out of engagement with-the fixed contact- 20.

Owing to theyfact that the contactsurfac'es of thev two contacts are extended-in their path of travel, the movablebcontactmaybe immediately swung, around "soas to reengage the fixed contact'without beingarrested by the pin 23 and.consequentlythemotormay,

if so desired, be immediately started without other manipulation than the manual key manipulation referred to. v

The parts may be adjusted so as to causea pin; 23 inpractime; thus, it may be made-either a few 'minuteso'rhours 'whole motor and switch mechanism, with. the exception of the ends of the binding in duration, but the motor is invariably stopped in due time so as to prevent any waste of the current and so as to overcome any liability of the motor being left in operation through the carelessness of the attendant, when the same should be shut down.

It willbe understood, of course, that the post and the key 24 are adapted to be inclosed in a casing indicated by dotted lines in the drawing, whereby they are protected from injury and accumulations of dirt or dust. v

Having thus described my invention,what I claim and desire to secure by Letters Patent ofthe-United States is,,

1. In an electrically operated advertising device, the combination with an electric motor and gearing driven thereby, of a switch mechanism .for breaking the motor circuit embodying a fixed contact, a second contact rotatable about an axis into engagement with the fixed contact, said movable contact being adapted to rotate in one direction only, driving connections intermediate the motor and movable contact for rotating the same and separating the contacts, and manually operated means directly cooperating with the movable contact for positively rotating it in the same directionwherebythe contacts are again restored to their operative positions.

2. In an electrically operated advertisingdevice, the combination with an electric motor and gearing driven thereby, of a timed switching mechanism for rupturing the motor circuit, embodying a rotary switch arm having a contact surface, and a cooperating fixed contact, said switch arm being rotatable in one direction only, a driving connection directly engaging the switch arm for positively rotating the same to separate the contacts and rupture the circuit, and rotary means manually operated for positively rotating the switch arm farther in the same direction to reestablish its operative engagement with the fixed contact.

3. Im an electricallyoperated advertising device, the combination with an electric motor and gearing driven thereby, of a switch for rupturing the motor circuit, embodying bination with an electric motor, gearing driven thereby andswitch operating conne'ctions driven'by said gearing, of a switching mechanism for rupturing the motor circuit embodying a fixed resilient contact, a rotary switch arm having a contact surface for cooperating with said fixed contact, an operating wheel in the driving connections having a projection for direct cooperation with said switch arm for rotating the latterto separate the contacts and rupture the circuit, and manual means for further rotat-- ing the switch arm in the same direction to efiect contact between the contact surfaces and establish the motor circuit.

5. In an apparatus such as described, the combination with the electric motor and gearing driven thereby, of a switch mechanism for rupturing the motor cir'cuit em bodying a fixed resilient contact, a rotary switch arm having a contact surface extending in the line of its movement, an operating wheel driven from said gearing, a projection on. said operating wheel in position to directly cooperate with the switch arm and rotate the latter out of engagement with the fixed contact, and a manually operated key for still further advancing the switch arm in the same direction to reestablish the engagement between the arm and fixed contact.

6. In an apparatus such as described, the combination with the electric motor and gearing driven thereby, of switching mechanism for rupturing the motor circuit at a predetermined time embodying a fixed con- "tact, a rotary switch arm having a contact surface for cooperation with the said fixed contact, an operating wheel journaled on an axis coincident with the axisof the switch arm and having a projection thereon for cooperating directly with and rotating said arm, but leaving the arm' free to advance independently of the wheel. a rotary key having a projection 'for'cooperation with the switch arm, whereby the arm may be manually rotated in the same directionv to reestablish the circuit independently of the operating wheel and its projection, and in termittent driving connections intermediate said wheel and motor operated gearing.

7. In an apparatus such as described, the combination with the electric motor, of a switch mechanism for rupturing the motor circuit at a predetermined time, embodying a fixed contact, a rotary switch arm for cooperation therewith, an operating wheel loosely engaging said arm to rotate the same out of engagement with the fixedcontact, said arm being free to rotate independently of said wheel, a worm shaft'for operating said wheel and intermittent driving connections intermediate said worm shaft and motor, substantially as described.

8. In an apparatus such as described, the

combination with an electric motor and gearing driven thereby, of a switching mechanism for rupturing the motor circuit, embodying-a fixed contact, a rotary switch arm having a contact surface for cooperating with the fixed contact, an operating wheel having a rigid projection for direct co6peration with the switch arm and driving connections intermediate the gearing and operating wheel embodying a lost motion connection.

9. In an apparatus such as described, the combination with an electric motor and gearing driven thereby, of a switching mechanism for rupturing the motor circuit embodying a fixed resilient contact, a rotary switch arm-having a contact surface for cooperation with the fixed contact, said switch arm being free to advance under the impelling force of the resilient fixed contact, an operating Wheel, a rigid projection moved by said operating wheel for rotating the switch arm without restricting its forward movement, and operating connections intermediate said wheel .and motor driven gear- 111g.

10. In an apparatus of the class described, the combination with an electric motor and gearing driven thereby, a switching mechanism for rupturing the motor circuit embodying fixed and movable contacts, and manually operated means for restablishing connection between the contacts, of an oper ating wheel, a reciprocating operating arm,

a means on said arm for-cooperating with said wheel, an adjustable link and connectionsintermediate said link and motor driven gearing for actuating said operating wheel, said wheel having a projection thereon for cooperation with the movable contact whereby when the operating wheel is actuated the movable contact is rotated and the motor circuit broken.

JOHN BUGKLEYW V Witnesses:

C. H. CHASE, CHARLES L. WARREN. 

